Junction box and explosion-proof motor

Abstract

The utility model discloses a junction box and an explosion-proof motor, belonging to the explosion-proof motor technology field, the junction box comprises a junction box body and a wiring sealing member arranged on the junction box body and used for conducting wire sealing connection, the wiring sealing member comprises: a hollow bolt embedded on the outer wall of the junction box body and used for conducting wire threading, the conical surface convex ring is fixed on the hollow bolt and is used for opening the port of the wire leather sheath, and the thread bushing is arranged on the hollow bolt in a threaded manner. According to the utility model, when the lead and the box body are installed in a penetrating manner, the end of the lead leather sheath opened by the conical convex ring can be sleeved with the conical groove, and the end of the lead leather sheath is pressed between the conical groove and the conical convex ring in cooperation with the inclined cambered surface design of the opposite surfaces of the conical groove and the conical convex ring, so that a sealing element is replaced; a good sealing effect can be achieved, and due to the fact that the material quality of the wire leather sheath is excellent, the single-time service life is long, and frequent replacement is not needed.

Description

Technical Field

[0001] The utility model relates to the technical field of explosion-proof motors, in particular to a junction box and an explosion-proof motor. Background Art

[0002] Due to their excellent sealing and safety, explosion-proof motors are widely used in relatively dangerous environments, such as the production and processing of oil, natural gas, and flammable and explosive items. Since static electricity or electric sparks cannot be generated in most cases in the working environment of explosion-proof motors, their power terminals generally use highly sealed junction boxes. Some existing junction boxes use airbag seals at the threading points, which have excellent sealing effects. However, since seals are consumables, the cost of replacing a single airbag seal with good material is high, and the replacement frequency of airbag seals with relatively poor material is high, which is inconvenient to use.

[0003] The existing patent application number: 202322236996.3 discloses a junction box for explosion-proof motors. When installing the wire, the device pushes the pressure plate to squeeze the first airbag during the tightening process by twisting the adjustment screw ring, thereby inflating the second airbag, thereby improving the sealing between the second airbag and the wire. In the above-mentioned prior art, when the device is used for a long time, the pressure plate always keeps squeezing the first airbag, while the second airbag always keeps a relatively tight expansion state. If both use better materials, the cost of a single replacement will increase. If both use relatively poor materials, the replacement frequency will be high, which is inconvenient to use. Utility Model Content

[0004] The purpose of the utility model is to provide a medical elastomer material purification device to solve the problem proposed in the above background technology that the airbag material is kept in a relatively tight state for a long time, which is prone to excessive fatigue and damage. If a good material is used for an airbag, the replacement cost of a single airbag is high. If a relatively inferior material is used, the replacement frequency will be high, which is inconvenient to use.

[0005] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0006] As a first aspect of the utility model, a junction box is provided, comprising a junction box body and a junction sealing member provided on the junction box body for sealing and connecting wires, wherein the junction sealing member comprises:

[0007] A hollow bolt embedded on the outer wall of the junction box body for guiding the wires.

[0008] A conical convex ring fixed on the hollow bolt is used to open the end of the wire sheath.

[0009] A threaded sleeve is threadedly arranged on the hollow bolt.

[0010] A limiting ring groove is arranged on the inner wall of the threaded sleeve, and the inner wall of the limiting ring groove and the inner wall of the threaded sleeve are combined to form a limiting collar.

[0011] A wiring ring is slidably mounted on the conductor, one end face of the wiring ring is provided with a conical groove, the outer wall of the wiring ring is provided with a connecting groove, the inner wall of the connecting groove and the outer wall of the wiring ring are combined to form an annular connecting block, the connecting block is rotatably mounted in the limiting ring groove, and the limiting ring is rotatably mounted in the connecting groove.

[0012] Furthermore, the conical surface groove matches the conical surface convex ring, and the end of the wire sheath is arranged between the conical surface convex ring and the conical surface groove.

[0013] Furthermore, the cross-sectional shapes of the limiting ring groove and the connecting groove are both L-shaped, and a sealing sheet is pasted on the inner wall of the limiting ring groove.

[0014] Furthermore, the diameter of the hollow bolt matches the inner diameter of the wire sheath, and the hollow bolt is located between the conical convex ring and the junction box body.

[0015] Furthermore, the junction box body comprises a box body for accommodating the wiring terminals and the wire ends, and a sealing top cover detachably mounted on the box body.

[0016] Furthermore, the sealing top cover includes a top cover body and a hollow reinforcement plate fixed to the bottom of the top cover body, the edge of the hollow reinforcement plate and the edge of the top cover body together form a sealing slot, the sealing slot matches the top edge of the box body, and the inner wall of the sealing slot is fixedly connected with a sealing gasket.

[0017] Furthermore, screw holes for bolt fixing are provided at the top of the box body and the four corners of the top cover body, and one side of the box body is fixedly connected with the hollow bolt.

[0018] As a second aspect of the present invention, an explosion-proof motor is provided. The explosion-proof motor has the above-mentioned junction box.

[0019] Compared with the prior art, one or more of the above technical solutions have the following beneficial effects:

[0020] 1. When the utility model is inserted and installed between the wire and the box body, the wiring ring will be pulled during the tightening of the threaded sleeve, so that the conical groove is sleeved on the outside of the stretched wire sheath end. Since the opposite surfaces of the conical convex ring and the conical groove are inclined arc surfaces, the end of the wire sheath is pressed between the two during the tightening of the threaded sleeve, thereby replacing the seal, which can achieve a good sealing effect, and because the material quality of the wire sheath is good, the single service life is long and there is no need for frequent replacement;

[0021] 2. The utility model utilizes the wire sheath as a sealing loss part. When excessive material fatigue occurs in the wire sheath between the conical convex ring and the conical groove, only the fatigue damaged part of the wire sheath end needs to be cut off and then reinstalled, which greatly saves the replacement cost of the sealing loss part. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is an axonometric drawing of the utility model;

[0023] Figure 2 It is a partial cross-sectional view of the utility model;

[0024] Figure 3 for Figure 2 A magnified view of part A;

[0025] Figure 4 It is a bottom-up axonometric view of the top cover in the utility model.

[0026] In the figure: 1. junction box body; 11. box body; 12. sealing top cover; 121. top cover body; 122. hollow reinforcement plate; 123. sealing slot; 124. sealing gasket; 2. wiring seal; 21. hollow bolt; 22. conical convex ring; 23. threaded sleeve; 24. limiting ring groove; 25. limiting sleeve; 26. wiring sleeve; 27. connection groove; 28. connection block; 29. ​​conical groove. DETAILED DESCRIPTION

[0027] In order to enable those skilled in the art to better understand the solution of the present application, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application.

[0028] like Figures 1 to 4 As shown, as a first aspect of the utility model, a junction box is provided, comprising a junction box body 1 and a junction seal 2 provided on the junction box body 1 for sealing and connecting wires, wherein the junction seal 2 comprises:

[0029] A hollow bolt 21 is embedded on the outer wall of the junction box body 1 and is used for guiding the wires.

[0030] A conical convex ring 22 is fixed on the hollow bolt 21 and is used to open the end of the wire sheath.

[0031] The threaded sleeve 23 is threadedly disposed on the hollow bolt 21 .

[0032] A limiting ring groove 24 is provided on the inner wall of the threaded sleeve 23 , and the inner wall of the limiting ring groove 24 and the inner wall of the threaded sleeve 23 together form a limiting collar 25 .

[0033] A wiring ring 26 is slidably mounted on the conductor, and a conical groove 29 is provided on one end face of the wiring ring 26. A connecting groove 27 is provided on the outer wall of the wiring ring 26. The inner wall of the connecting groove 27 and the outer wall of the wiring ring 26 together form an annular connecting block 28. The connecting block 28 is rotatably mounted in the limiting ring groove 24, and the limiting ring 25 is rotatably mounted in the connecting groove 27.

[0034] When installing between the wire and the junction box body 1, first pass the end of the wire through the wiring collar 26 and the inside of the threaded sleeve 23 in turn, and pass it out from one end of the threaded sleeve 23, then cut off a section of the end ring of the wire sheath, so that the exposed wire core is inserted from one end of the conical convex ring 22, and passes through the conical convex ring 22, the hollow bolt 21 and the junction box body 1 in turn, and extends into the junction box body 1, so as to be electrically connected to the circuit, and then insert one end of the wire sheath into the outside of the conical convex ring 22, so that the conical convex ring 22 expands the end of the wire sheath to a certain size and wraps a part of the outer wall of the conical convex ring 22, and then the threaded sleeve 23 is threadedly connected to the hollow bolt 21. When the threaded sleeve 23 is tightened, the wiring collar 26 will be pulled closer to the hollow bolt along its axial direction. During the process, the conical groove 29 will be sleeved on the outside of the end of the wire holster and press it tightly between the conical groove 29 and the conical convex ring 22. Since the opposite surfaces of the conical groove 29 and the conical convex ring 22 are conical surfaces, the tighter the threaded sleeve 23 is, the tighter the wire holster between the conical groove 29 and the conical convex ring 22 will be pressed, and the sealing will become better and better, until the threaded sleeve 23 is screwed into place. Since the material of the wire holster is better than most non-metallic seals, replacing the seal with it can save the use cost and later replacement cost of the seal. When the material of the wire holster between the conical groove 29 and the conical convex ring 22 is excessively fatigued, it is only necessary to cut off the fatigued part of the wire holster and install it again. The operation is simple and convenient, and the service life is relatively long, which reduces the replacement frequency and achieves multiple goals at one stroke.

[0035] In this embodiment, the conical groove 29 matches the conical convex ring 22, and the end of the wire sheath is arranged between the conical convex ring 22 and the conical groove 29. When the wire is installed, the end of the wire sheath can be pressed between the conical convex ring 22 and the conical groove 29 during the tightening of the threaded sleeve 23 through the cooperation of the wiring ring 26 and the conical convex ring 22 to seal the gap between the two. The tighter the threaded sleeve 23 is, the tighter the wire sheath between the conical groove 29 and the conical convex ring 22 is pressed, and the better the sealing is. In addition, since the material of the wire sheath is better than most non-metallic seals, it can replace non-metallic seals and have a longer service life. When the material of the wire sheath between the conical groove 29 and the conical convex ring 22 is excessively fatigued, it is only necessary to cut off the fatigued part of the wire sheath and install it again. The operation is simple and convenient, and the service life is relatively long, which reduces the replacement frequency and achieves multiple goals at one stroke.

[0036] In this embodiment, the cross-sectional shapes of the limiting ring groove 24 and the connecting groove 27 are both L-shaped, and a sealing sheet is pasted on the inner wall of the limiting ring groove 24. The L-shaped cross-sectional design can not only improve the axial connection firmness and stability between the threaded sleeve 23 and the wiring sleeve ring 26, but also cooperate with the sealing sheet arranged on the inner wall to improve the sealing effect of the connection between the two. In combination with the wire sheath pressed between the conical groove 29 and the conical convex ring 22, the sealing of the connection between the wire and the junction box body 1 is further improved, thereby preventing the circuit on-off action inside the junction box body 1 from affecting the outside of the junction box body 1 and causing unnecessary danger.

[0037] In this embodiment, the caliber of the hollow bolt 21 matches the inner diameter of the wire sheath, and the hollow bolt 21 is located between the conical convex ring 22 and the junction box body 1. Such a design can enable the wire core to pass through the conical convex ring 22 and the interior of the hollow bolt 21 more smoothly and extend to the interior of the junction box body 1, making it easier to connect the wire core to the circuit, and can also enable the wire core and the conical convex ring 22 and the inner wall of the hollow bolt 21 to fit more closely together, thereby improving the sealing effect of the wire sheath on the conical groove 29 and the conical convex ring 22.

[0038] In this embodiment, the junction box body 1 includes a box body 11 for accommodating wiring terminals and wire ends, and a sealing top cover 12 detachably installed on the box body 11. By removing the sealing top cover 12, it is convenient for the user to maintain and repair the electrical components inside the box body 11 and replace damaged electrical components. After installation, the opening on the box body 11 is covered and sealed to isolate the inside and outside of the box body 11, avoid various factors inside and outside the box body 11 from affecting each other, and avoid potential safety hazards, thereby improving the safety of the box body 11.

[0039] In this embodiment, the sealed top cover 12 includes a top cover body 121 and a hollow reinforcing plate 122 fixed to the bottom of the top cover body 121. The edge of the hollow reinforcing plate 122 and the edge of the top cover body 121 are combined to form a sealing slot 123. The sealing slot 123 matches the top edge of the box body 11. The inner wall of the sealing slot 123 is fixedly connected with a sealing gasket 124. The structural strength of the top cover body 121 is strengthened by the provision of the hollow reinforcing plate 122 to facilitate the strength when the inside of the box body 11 is evacuated, to avoid large deformation and affect the sealing of the box body 11, and to automatically restore and always maintain good sealing when the inert gas is subsequently filled. When the top cover body 121 is installed, the sealing gasket 124 improves the sealing of the contact surface between the top cover body 121 and the box body 11.

[0040] In this embodiment, screw holes for bolt fixing are provided at the top of the box body 11 and the four corners of the top cover body 121, and one side of the box body 11 is fixedly connected with the hollow bolt 21, which can be threaded through the screw hole on the top cover body 121 and threadedly connected with the screw hole on the box body 11. The extrusion pressure of the contact surface between the top cover body 121 and the box body 11 can be increased by tightening the connecting bolt, so that the contact surface between the two can fully contact the surface of the sealing gasket 124, thereby improving the sealing performance.

[0041] As a second aspect of the present invention, an explosion-proof motor is provided. The explosion-proof motor has a junction box as described above.

[0042] The above description is only the preferred embodiment of the utility model, and the parts not described in the utility model can be implemented by adopting or drawing on existing technologies. Of course, the above description is not a limitation of the utility model, and the utility model is not limited to the above examples. The changes, modifications, additions or substitutions made by technicians in this technical field within the essential scope of the utility model should also fall within the protection scope of the utility model.

Claims

1. A junction box, characterized in that: The invention comprises a junction box body (1) and a junction sealing member (2) provided on the junction box body (1) and used for sealing and connecting wires, wherein the junction sealing member (2) comprises: A hollow bolt (21) embedded in the outer wall of the junction box body (1) and used for threading a wire; A conical convex ring (22) fixed on the hollow bolt (21) for opening the end of the wire sheath; A threaded sleeve (23) threadedly disposed on the hollow bolt (21); A limiting ring groove (24) is provided on the inner wall of the threaded sleeve (23), wherein the inner wall of the limiting ring groove (24) and the inner wall of the threaded sleeve (23) together form a limiting collar (25); A wiring ring (26) is slidably mounted on the wire, one end face of the wiring ring (26) is provided with a conical groove (29), the outer wall of the wiring ring (26) is provided with a connecting groove (27), the inner wall of the connecting groove (27) and the outer wall of the wiring ring (26) are combined to form an annular connecting block (28), the connecting block (28) is rotatably mounted in the limiting ring groove (24), and the limiting ring (25) is rotatably mounted in the connecting groove (27).

2. The junction box according to claim 1, characterized in that: The conical surface groove (29) matches the conical surface convex ring (22), and the end of the wire sheath is arranged between the conical surface convex ring (22) and the conical surface groove (29).

3. The junction box according to claim 2, characterized in that: The cross-sectional shapes of the limiting ring groove (24) and the connecting groove (27) are both L-shaped, and a sealing sheet is adhered to the inner wall of the limiting ring groove (24).

4. The junction box according to claim 3, characterized in that: The caliber of the hollow bolt (21) matches the inner diameter of the wire sheath, and the hollow bolt (21) is located between the conical convex ring (22) and the junction box body (1).

5. The junction box according to claim 4, characterized in that: The junction box body (1) comprises a box body (11) for accommodating a wiring terminal and a wire end, and a sealing top cover (12) detachably mounted on the box body (11).

6. The junction box according to claim 5, characterized in that: The sealed top cover (12) comprises a top cover body (121) and a hollow reinforcing plate (122) fixed to the bottom of the top cover body (121); the edge of the hollow reinforcing plate (122) and the edge of the top cover body (121) are combined to form a sealing slot (123); the sealing slot (123) matches the top edge of the box body (11); and a sealing gasket (124) is fixedly connected to the inner wall of the sealing slot (123).

7. The junction box according to claim 6, characterized in that: Screw holes for bolted connection are provided at the top of the box body (11) and the four corners of the top cover body (121), and one side of the box body (11) is fixedly connected to the hollow bolt (21).

8. An explosion-proof motor, characterized in that: The explosion-proof motor has a junction box as described in any one of claims 1-7.

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